US9125264B2 - Lighting device - Google Patents
Lighting device Download PDFInfo
- Publication number
- US9125264B2 US9125264B2 US14/405,091 US201314405091A US9125264B2 US 9125264 B2 US9125264 B2 US 9125264B2 US 201314405091 A US201314405091 A US 201314405091A US 9125264 B2 US9125264 B2 US 9125264B2
- Authority
- US
- United States
- Prior art keywords
- lighting
- voltage
- power supply
- lighting power
- power supplies
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- H05B33/0815—
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/40—Details of LED load circuits
-
- H05B33/0818—
-
- H05B33/0821—
-
- H05B33/0827—
-
- H05B33/089—
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
- H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/355—Power factor correction [PFC]; Reactive power compensation
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/38—Switched mode power supply [SMPS] using boost topology
Definitions
- the disclosure relates to a lighting device.
- a lighting device configured to power light-emitting diodes (LEDs) as a light source has been known.
- LEDs light-emitting diodes
- a lighting device configured to power both a main light source formed of a large number of LEDs and an auxiliary light source which is formed of a small number of LEDs and configured to be driven as indirect light for example (e.g., JP Pub. No. 2011-222360).
- FIG. 4 shows a circuit diagram of a conventional lighting device configured to power two light sources.
- the lighting device is formed of a full-wave rectifier circuit 101 , a power-factor correction circuit 102 , a first lighting power supply 103 and a second lighting power supply 104 .
- the lighting device of which input power supply is a commercial power supply E 101 (100V, 50 Hz/60 Hz), is configured to supply lighting power to a first light source 105 as a main light source and a second light source 106 as an auxiliary light source.
- E 101 commercial power supply E 101
- the full-wave rectifier circuit 101 is formed of a diode bridge and configured to full-wave rectify an AC voltage Vac from the commercial power supply E 101 to generate a rectified voltage Vdb.
- the power-factor correction circuit 102 is formed of a step-up chopper circuit including an inductor L 101 , a diode D 101 , a switching device Q 101 and a capacitor C 101 .
- a series circuit of the inductor L 101 and the switching device Q 101 is connected between output ends of the full-wave rectifier circuit 101 .
- a series circuit of the diode D 101 and the capacitor C 101 is connected in parallel with the switching device Q 101 .
- the switching device Q 101 is repeatedly turned on and off by switching control by a switch controller (not shown).
- the first lighting power supply 103 is formed of a step-down chopper circuit including an inductor L 102 , a diode D 102 , a switching device Q 102 and a capacitor C 102 .
- a series circuit of the capacitor C 102 , the inductor L 102 and the switching device Q 102 is connected between both output ends of the power-factor correction circuit 102 .
- the diode D 102 is connected in parallel with a series circuit of the capacitor C 102 and the inductor L 102 .
- the switching device Q 102 is repeatedly turned on and off by switching control by a switch controller (not shown).
- the DC voltage Vdc 11 is consequently stepped down and a DC voltage Vdc 12 is generated between both ends of the capacitor C 102 .
- the first light source 105 is formed of light-emitting diodes LD 101 in series, and connected in parallel with the capacitor C 102 .
- the DC voltage Vdc 12 is to be applied thereto.
- the switch controller of the first lighting power supply 103 performs switching control of the switching device Q 102 to control the DC voltage Vdc 12 so as to supply a specified DC current to the first light source 105 , thereby supplying an electric current to the first light source 105 by constant current control.
- the DC voltage Vdc 12 is applied to the first light source 105 and the specified DC current flows therethrough, so that each light-emitting diode LD 101 is lit.
- the second lighting power supply 104 is formed of a step-down chopper circuit including an inductor L 103 , a diode D 103 , a switching device Q 103 and a capacitor C 103 .
- a series circuit of the capacitor C 103 , the inductor L 103 , and the switching device Q 103 is connected between output ends of the power-factor correction circuit 102 .
- the diode D 103 is connected in parallel with a series circuit of the capacitor C 103 and the inductor L 103 .
- the switching device Q 103 is repeatedly turned on and off by switching control by a switch controller (not shown).
- the DC voltage Vdc 11 is consequently stepped down and a DC voltage Vdc 13 is generated between both ends of the capacitor C 103 .
- the second light source 106 is formed of light-emitting diodes LD 101 in series, and connected in parallel with the capacitor C 103 .
- the DC voltage Vdc 13 is to be applied thereto.
- the switch controller of the second lighting power supply 104 performs switching control of the switching device Q 103 to control the DC voltage Vdc 13 so as to supply a specified DC current to the second light source 106 , thereby supplying an electric current to the second light source 106 by constant current control.
- the DC voltage Vdc 13 is applied to the second light source 106 and the specified DC current flows therethrough, so that each light-emitting diode LD 101 is lit.
- the first light source 105 is employed as the main light source, it is formed of more light-emitting diodes LD 101 than those of the second light source 106 . Therefore, the DC voltage Vdc 12 output from the first lighting power supply 103 is larger than the DC voltage Vdc 13 output from the second lighting power supply 104 . In the conventional example, the DC voltage Vdc 12 is set to 300V, and the DC voltage Vdc 13 is set to 20V.
- the DC voltage Vdc 11 output from the power-factor correction circuit 102 requires to be set higher than the DC voltages Vdc 12 and Vdc 13 .
- the DC voltage Vdc 11 output from the power-factor correction circuit 102 is set to 410V.
- the first and second lighting power supplies 103 and 104 are connected in parallel with each other.
- the first lighting power supply 103 of which input power supply is the power-factor correction circuit 102 , supplies lighting power to the first light source 105 .
- the second lighting power supply 104 of which input power supply is the power-factor correction circuit 102 , supplies lighting power to the second light source 106 .
- the present invention has been achieved in view of the above circumstances, and an object thereof is to provide a lighting device capable of achieving miniaturization and cost reduction thereof.
- a lighting device in an aspect of the present invention, includes a rectifier circuit, a power-factor correction circuit, a capacitor, one or more first lighting power supplies and one or more second lighting power supplies.
- the rectifier circuit is configured to rectify an AC voltage.
- the power-factor correction circuit is configured to receive the rectified voltage from the rectifier circuit to generate a first DC voltage.
- the capacitor is configured to reduce ripple of the rectified voltage to generate a second DC voltage.
- the one or more first lighting power supplies, of each of which input power supply is the first DC voltage are configured to supply lighting power to respective one or more first light sources each of which comprises one or more light emitting devices.
- the one or more second lighting power supplies are configured to supply lighting power to respective one or more second light sources each of which comprises one or more light emitting devices.
- An output voltage of the one or more second lighting power supplies is lower than an output voltage of the one or more first lighting power supplies.
- each of the one or more first lighting power supplies comprise a step-down chopper circuit.
- each of the one or more second lighting power supplies comprise a step-down chopper circuit.
- the one or more first lighting power supplies be two or more first lighting power supplies
- the one or more second lighting power supplies be two or more second lighting power supplies
- total output power of the two or more first lighting power supplies be larger than 25 W
- total output power of the two or more second lighting power supplies be 15 W or less.
- the second DC voltage be lower than the first DC voltage.
- the power-factor correction circuit be configured to step up the rectified voltage to generate the first DC voltage so that the first DC voltage is higher than the second DC voltage.
- the one or more first lighting power supplies be configured to step down the first DC voltage to generate respective output voltages of the one or more first lighting power supplies.
- the one or more second lighting power supplies be configured to step down the second DC voltage to generate respective output voltages of the one or more second lighting power supplies.
- the capacitor be connected in parallel with the power-factor correction circuit.
- the invention can reduce each withstand voltage of components constituting a second lighting power supply and achieve the miniaturization and cost reduction.
- FIG. 1 is a circuit diagram of a lighting device in accordance with embodiment 1 of the invention.
- FIG. 2 is a circuit diagram of a lighting device in accordance with embodiment 2 of the invention.
- FIG. 3A is waveform of an input current of the lighting device in embodiment 2 of the invention in a case where two first light sources are lit and two second light sources are unlit
- FIG. 3B is waveform of an input current of the lighting device in embodiment 2 of the invention in a case where two second light sources are lit and two first light sources are unlit
- FIG. 3C is waveform of an input current of the lighting device in embodiment 2 of the invention in a case where two first light sources and two second light sources are lit;
- FIG. 4 is a circuit diagram of a conventional lighting device.
- FIG. 1 shows a circuit diagram of a lighting device in the embodiment.
- the lighting device in the embodiment is formed of a full-wave rectifier circuit 1 , a power-factor correction circuit 2 , a first lighting power supply 3 , a second lighting power supply 4 , and a capacitor C 4 .
- the lighting device in the embodiment of which input power supply is a commercial power supply E 1 (100V, 50/60 Hz), is configured to supply lighting power to a first light source 5 as a main light source including a large number of light-emitting diodes LD 1 and a second light source 6 as an auxiliary light source that includes a small number of light-emitting diodes LD 1 and is configured to emit indirect light.
- E 1 commercial power supply
- the full-wave rectifier circuit 1 (a rectifier circuit) is formed of a diode bridge and configured to full-wave rectify an AC voltage Vac from the commercial power supply E 1 to generate a rectified voltage Vdb.
- the power-factor correction circuit 2 is formed of a step-up chopper circuit including an inductor L 1 , a diode D 1 , a switching device Q 1 and a capacitor C 1 .
- a series circuit of the inductor L 1 and the switching device Q 1 is connected between output ends of the full-wave rectifier circuit 1 .
- a series circuit of the diode D 1 and the capacitor C 1 is connected in parallel with the switching device Q 1 .
- the switching device Q 1 is repeatedly turned on and off by switching control by a switch controller (not shown).
- the rectified voltage Vdb is consequently stepped up and a DC voltage Vdc 1 (a first DC voltage) is generated between both ends of the capacitor C 1 .
- Harmonic distortion of an input current from the commercial power supply E 1 is reduced through the power-factor correction circuit 102 so that reduction in power factor is suppressed.
- the first lighting power supply 3 is formed of a step-down chopper circuit including an inductor L 2 , a diode D 2 , a switching device Q 2 and a capacitor C 2 .
- a series circuit of the capacitor C 2 , the inductor L 2 and the switching device Q 2 is connected between both output ends of the power-factor correction circuit 2 .
- the diode D 2 is connected in parallel with a series circuit of the capacitor C 2 and the inductor L 2 .
- the switching device Q 2 is repeatedly turned on and off by switching control by a switch controller (not shown).
- the DC voltage Vdc 1 is consequently stepped down and a DC voltage Vdc 2 (an output voltage of the first lighting power supply 3 , namely a first output voltage) is generated between both ends of the capacitor C 2 .
- the first light source 5 is formed of light-emitting diodes LD 1 (light-emitting devices) in series, and connected in parallel with the capacitor C 2 .
- the DC voltage Vdc 2 is to be applied thereto.
- the switch controller of the first lighting power supply 3 performs switching control of the switching device Q 2 to control the DC voltage Vdc 2 so as to supply a specified DC current to the first light source 5 , thereby supplying an electric current to the first light source 5 by constant current control.
- the DC voltage Vdc 2 is applied to the first light source 5 and the specified DC current flows therethrough, so that each light-emitting diode LD 1 is lit.
- the first light source 5 in the embodiment is formed of two or more light-emitting diodes LD 1 , but may be formed of a single light-emitting diode.
- the capacitor C 4 is connected between the output ends of the full-wave rectifier circuit 1 (i.e., connected in parallel with the power-factor correction circuit 2 ) and is configured to reduce ripple of the rectified voltage Vdb to generate a DC voltage Vdc 4 (a second DC voltage). That is, the full-wave rectifier circuit 1 and the capacitor C 4 constitute a capacitor input type rectifier/filter circuit.
- the second lighting power supply 4 is formed of a step-down chopper circuit including an inductor L 3 , a diode D 3 , a switching device Q 3 and a capacitor C 3 .
- a series circuit of the capacitor C 3 , the inductor L 3 and the switching device Q 3 is connected in parallel with the capacitor C 4 .
- the diode D 3 is connected in parallel with a series circuit of the capacitor C 3 and the inductor L 3 .
- the switching device Q 3 is repeatedly turned on and off by switching control by a switch controller (not shown).
- the DC voltage Vdc 4 is consequently stepped down and a DC voltage Vdc 3 (an output voltage of the second lighting power supply 4 , namely a second output voltage) is generated between both ends of the capacitor C 3 .
- the second light source 6 is formed of light-emitting diodes LD 1 (light-emitting devices) in series, and connected in parallel with the capacitor C 3 .
- the DC voltage Vdc 3 is to be applied thereto.
- the switch controller of the second lighting power supply 4 performs switching control of the switching device Q 3 to control the DC voltage Vdc 3 so as to supply a specified DC current to the second light source 6 , thereby supplying an electric current to the second light source 6 by constant current control.
- the DC voltage Vdc 3 is applied to the second light source 6 and the specified DC current flows therethrough, so that each light-emitting diode LD 1 is lit.
- the second light source 6 of the embodiment is formed of two or more light-emitting diodes LD 1 , but may be formed of a single light-emitting diode.
- the first light source 5 is employed as the main light source, and accordingly formed of more light-emitting diodes LD 1 than those of the second light source 6 . Therefore, the DC voltage Vdc 2 output from the first lighting power supply 3 is larger than the DC voltage Vdc 3 output from the second lighting power supply 4 .
- the DC voltage Vdc 2 is set to 300V
- the DC voltage Vdc 3 is set to 20V.
- the second lighting power supply 4 can step down the DC voltage Vdc 4 to generate the DC voltage Vdc 3 .
- the first lighting power supply 3 of which input power supply is the DC voltage Vdc 1 output from the power-factor correction circuit 2 , is to supply lighting power to the first light source 5 .
- the second lighting power supply 4 of which input power supply is the DC voltage Vdc 4 output from the capacitor C 4 , is to supply lighting power to the second light source 6 .
- the first lighting power supply 3 sets the DC voltage Vdc 1 to the input power supply thereof, and accordingly requires to be formed of components having rated voltages (withstand voltages) of 410V or more.
- the second lighting power supply 4 sets the DC voltage Vdc 4 lower than the DC voltage Vdc 1 to the input poser supply thereof, and can be accordingly formed of components having low rated voltages (withstand voltages) of, for example, 250V in comparison with a case where the DC voltage Vdc 1 is employed as the input power supply.
- the capacitor C 4 having a low output voltage for an input power supply of the second lighting power supply 4 having a lower output power it is possible to achieve miniaturization and cost reduction of the lighting device per se and components constituting the second lighting power supply 4 .
- FIG. 2 shows a circuit diagram of a lighting device in the embodiment. Like kind elements are assigned the same reference numerals as depicted in embodiment 1 and the explanation thereof is omitted.
- the lighting device in the embodiment includes two first lighting power supplies 3 a and 3 b and two second lighting power supplies 4 a and 4 b , and is configured to supply lighting power to first light sources 5 a and 5 b and second light sources 6 a and 6 b .
- Each of the first lighting power supplies 3 a and 3 b has an identical configuration of the first lighting power supply 3 in embodiment 1, and the explanation of the first lighting power supplies 3 a and 3 b is omitted by adding “a” or “b” to tails of the reference numeral.
- each of the second lighting power supplies 4 a and 4 b has an identical configuration of the second lighting power supply 4 in embodiment 1, and the explanation of the second lighting power supplies 4 a and 4 b is omitted by adding “a” or “b” to tails of the reference numeral.
- the DC voltage Vdc 2 a output from the first lighting power supply 3 a is set to 250V
- a DC current supplied to the first light source 5 a is set to 350 mA
- output power of the first lighting power supply 3 a is about 88 W.
- the DC voltage Vdc 2 b output from the first lighting power supply 3 b is set to 250V
- a DC current supplied to the first light source 5 b is set to 350 mA
- output power of the first lighting power supply 3 b is about 88 W.
- the DC voltage Vdc 3 a output from the second lighting power supply 4 a is set to 26V
- a DC current supplied to the second light source 6 a is set to 350 mA
- output power of the second lighting power supply 4 a is about 9 W.
- the DC voltage Vdc 3 b output from the second lighting power supply 4 b is set to 17V
- a DC current supplied to the second light source 6 b is set to 350 mA
- output power of the second lighting power supply 4 b is about 6 W.
- the second lighting power supplies 4 a and 4 b employ, as their input power supply, not the DC voltage Vdc 1 output from the power-factor correction circuit 2 but the DC voltage Vdc 4 output from the capacitor C 4 .
- the second lighting power supplies 4 a and 4 b can be accordingly formed of components having low rated voltages (withstand voltages). It is consequently possible to achieve miniaturization and cost reduction of components and the lighting device per se.
- Harmonic distortion of an input current from a commercial power supply E 1 requires satisfying Class C Standard established by IEC (International Electrotechnical Commission) (see IEC61000-3-2).
- FIG. 3A shows waveform of an input current (an input current from the commercial power supply E 1 ) in a case where the first light sources 5 a and 5 b are lit and the second light sources 6 a and 6 b are unlit.
- FIG. 3B shows waveform of the input current in a case where the second light sources 6 a and 6 b are lit and the first light sources 5 a and 5 b are unlit.
- FIG. 3C shows waveform of the input current in a case where the first light sources 5 a and 5 b and the second light sources 6 a and 6 b are lit.
- the first lighting power supplies 3 a and 3 b for supplying lighting power to respective first light sources 5 a and 5 b employ the power-factor correction circuit 2 as their input power supply. Therefore, in the case where the first light sources 5 a and 5 b are lit and the second light sources 6 a and 6 b are unlit, the power factor is improved and the harmonic distortion is reduced (see FIG. 3A ).
- the second lighting power supplies 4 a and 4 b for supplying lighting power to respective second light sources 6 a and 6 b employ, as their input power supply, a capacitor input type rectifier circuit including a full-wave rectifier circuit 1 and a capacitor C 4 . Therefore, in the case where the second light sources 6 a and 6 b are lit and the first light sources 5 a and 5 b are unlit, an inrush current into the capacitor C 4 occur at a time point t 1 , t 11 after a specified time elapses from time point (t 0 , t 10 ) of polarity inversion of an input current (having a cycle T 1 ) as shown in FIG. 3B .
- waveform of the input current becomes synthesized waveform of input currents shown in FIGS. 3A and 3B , as shown in FIG. 3C .
- Harmonic distortion of the input current in the case where the first light sources 5 a and 5 b and the second light sources 6 a and 6 b are lit, can satisfy Class C Standard established by IEC. Further, in a case where total output power of the first lighting power supplies 3 a and 3 b is larger than 25 W and total output power of the second lighting power supplies 4 a and 4 b is 15 W or less, harmonic distortion of the input current can satisfy Class C Standard established by IEC.
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Description
Claims (9)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012128259A JP2013254602A (en) | 2012-06-05 | 2012-06-05 | Lighting device |
JP2012-128259 | 2012-06-05 | ||
PCT/JP2013/003288 WO2013183244A1 (en) | 2012-06-05 | 2013-05-23 | Lighting device |
Publications (2)
Publication Number | Publication Date |
---|---|
US20150173141A1 US20150173141A1 (en) | 2015-06-18 |
US9125264B2 true US9125264B2 (en) | 2015-09-01 |
Family
ID=49711652
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/405,091 Expired - Fee Related US9125264B2 (en) | 2012-06-05 | 2013-05-23 | Lighting device |
Country Status (3)
Country | Link |
---|---|
US (1) | US9125264B2 (en) |
JP (1) | JP2013254602A (en) |
WO (1) | WO2013183244A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10757782B2 (en) * | 2016-11-24 | 2020-08-25 | Signify Holding B.V. | AC/DC converters having power factor correction |
WO2024068277A1 (en) * | 2022-09-27 | 2024-04-04 | Signify Holding B.V. | Smps series regulator with energy recycle back to the source |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08191569A (en) | 1995-01-09 | 1996-07-23 | Fuji Xerox Co Ltd | Power supply device |
JP2009230949A (en) | 2008-03-21 | 2009-10-08 | Toshiba Lighting & Technology Corp | Lighting device |
EP2213932A1 (en) | 2009-01-30 | 2010-08-04 | Panasonic Electric Works Co., Ltd. | LED illumination fixture |
JP2011165400A (en) | 2010-02-05 | 2011-08-25 | Toshiba Lighting & Technology Corp | Power supply circuit and lighting system |
JP2011171232A (en) | 2010-02-22 | 2011-09-01 | Panasonic Electric Works Co Ltd | Led lighting circuit |
US20110249069A1 (en) | 2010-04-12 | 2011-10-13 | Oyama Tadaaki | Light source driving device, and image processing device, image reading device and image forming apparatus using the light source driving device |
JP2011210446A (en) | 2010-03-29 | 2011-10-20 | Wako Denken Kk | Led power supply circuit |
US20110266964A1 (en) * | 2010-04-30 | 2011-11-03 | Minebea Co., Ltd. | Electrical appliance having a lighting device having light emitting diodes |
US20150154917A1 (en) * | 2011-12-21 | 2015-06-04 | Seoul Semiconductor Co., Ltd. | Backlight module, method for driving same and display device using same |
US20150171757A1 (en) * | 2013-12-13 | 2015-06-18 | Lg Innotek Co., Ltd. | Multiple-output dc/dc converter and power supply having the same |
-
2012
- 2012-06-05 JP JP2012128259A patent/JP2013254602A/en active Pending
-
2013
- 2013-05-23 WO PCT/JP2013/003288 patent/WO2013183244A1/en active Application Filing
- 2013-05-23 US US14/405,091 patent/US9125264B2/en not_active Expired - Fee Related
Patent Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08191569A (en) | 1995-01-09 | 1996-07-23 | Fuji Xerox Co Ltd | Power supply device |
JP2009230949A (en) | 2008-03-21 | 2009-10-08 | Toshiba Lighting & Technology Corp | Lighting device |
EP2213932A1 (en) | 2009-01-30 | 2010-08-04 | Panasonic Electric Works Co., Ltd. | LED illumination fixture |
JP2010177131A (en) | 2009-01-30 | 2010-08-12 | Panasonic Electric Works Co Ltd | Led luminaire |
JP2011165400A (en) | 2010-02-05 | 2011-08-25 | Toshiba Lighting & Technology Corp | Power supply circuit and lighting system |
JP2011171232A (en) | 2010-02-22 | 2011-09-01 | Panasonic Electric Works Co Ltd | Led lighting circuit |
JP2011210446A (en) | 2010-03-29 | 2011-10-20 | Wako Denken Kk | Led power supply circuit |
US20110249069A1 (en) | 2010-04-12 | 2011-10-13 | Oyama Tadaaki | Light source driving device, and image processing device, image reading device and image forming apparatus using the light source driving device |
JP2011222360A (en) | 2010-04-12 | 2011-11-04 | Ricoh Co Ltd | Light source driving device, image processing device, image reading device, and image forming device |
US20110266964A1 (en) * | 2010-04-30 | 2011-11-03 | Minebea Co., Ltd. | Electrical appliance having a lighting device having light emitting diodes |
US20150154917A1 (en) * | 2011-12-21 | 2015-06-04 | Seoul Semiconductor Co., Ltd. | Backlight module, method for driving same and display device using same |
US20150171757A1 (en) * | 2013-12-13 | 2015-06-18 | Lg Innotek Co., Ltd. | Multiple-output dc/dc converter and power supply having the same |
Non-Patent Citations (2)
Title |
---|
Form PCT/ISA/237 for corresponding International Application No. PCT/JP2013/003288 dated Jul. 2, 2013. |
International Search Report for corresponding International Application No. PCT/JP2013/003288 mailed Jul. 2, 2013. |
Also Published As
Publication number | Publication date |
---|---|
WO2013183244A1 (en) | 2013-12-12 |
JP2013254602A (en) | 2013-12-19 |
US20150173141A1 (en) | 2015-06-18 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
Camponogara et al. | Offline LED driver for street lighting with an optimized cascade structure | |
US9215769B2 (en) | LED backlight driver system and associated method of operation | |
US8957592B2 (en) | Electrical power conversion device and lighting device | |
JP2015084616A (en) | Lighting device and light fixture | |
KR20110136537A (en) | Led driving circuit and method for protecting from high voltage and driving with constant current | |
Lin et al. | A high efficiency integrated step-down Cuk and flyback converter for LED power driver | |
US9125264B2 (en) | Lighting device | |
Jha et al. | Zeta converter for power quality improvement for multi-string LED driver | |
JP6070049B2 (en) | LED lighting device and LED lighting apparatus | |
JP2019029351A (en) | Illumination system | |
JP6182972B2 (en) | Lighting device and lighting device | |
Kim et al. | Boost integrated flyback AC-DC converter with valley fill circuit for LED light bulb | |
JP2008218150A (en) | Illumination device and control circuit | |
US9055623B1 (en) | Light-emitting diode offline buck converter and method of controlling thereof | |
JP6382286B2 (en) | LED voltage drive circuit | |
Jha et al. | Modified bridgeless landsman PFC converter for LED driver | |
JP6134492B2 (en) | Lighting device | |
Hariprasath et al. | A valley-fill SEPIC-derived power factor correction topology for LED lighting applications using one cycle control technique | |
JP5744277B2 (en) | Hybrid type constant current LED light | |
da Fonseca et al. | An electronic AC power system with buck PFC and linear regulator to drive and control the current of power LEDs | |
KR101360618B1 (en) | Power factor correction circuit and power supply thereof | |
JP6357790B2 (en) | Lighting device and lighting apparatus | |
KR101349576B1 (en) | CIRCUITS FOR CONTROLLING OF A light emitting diode | |
Damodaran et al. | Double Integrated-Buck Boost Converter versus Double Integrated-Buck Topology for LED Lamps | |
US9462644B2 (en) | Power supply device |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: PANASONIC CORPORATION, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TSUJIMURA, MITSUHIRO;REEL/FRAME:034965/0121 Effective date: 20140806 |
|
AS | Assignment |
Owner name: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PANASONIC CORPORATION;REEL/FRAME:035045/0413 Effective date: 20150130 Owner name: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LT Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PANASONIC CORPORATION;REEL/FRAME:035045/0413 Effective date: 20150130 |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
MAFP | Maintenance fee payment |
Free format text: PAYMENT OF MAINTENANCE FEE, 4TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1551); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY Year of fee payment: 4 |
|
FEPP | Fee payment procedure |
Free format text: MAINTENANCE FEE REMINDER MAILED (ORIGINAL EVENT CODE: REM.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
LAPS | Lapse for failure to pay maintenance fees |
Free format text: PATENT EXPIRED FOR FAILURE TO PAY MAINTENANCE FEES (ORIGINAL EVENT CODE: EXP.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20230901 |